18019312 has 20 divisors (see below), whose sum is σ = 35183016. Its totient is φ = 8939840.

The previous prime is 18019307. The next prime is 18019321. The reversal of 18019312 is 21391081.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2203 + ... + 6394.

Almost surely, 2^18019312 is an apocalyptic number.

It is an amenable number.

18019312 is a deficient number, since it is larger than the sum of its proper divisors (17163704).

18019312 is a wasteful number, since it uses less digits than its factorization.

18019312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8736 (or 8730 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 18019312 is about 4244.9160180150. The cubic root of 18019312 is about 262.1678313993.

The spelling of 18019312 in words is "eighteen million, nineteen thousand, three hundred twelve".